You could always skip the integrity check, but compressing and then decompressing the file shouldn't be modifying the file at all. Check the checksum of the original and decompressed file, and if it is different, something is wrong on your end.

Thank's

I know that I can bypass the check with the "skip" button. What I want is to make an archive with the setup an the *.bin files included. In Winrar you can start the setup-file after extraction automaticly. This fails cause the GOG-Installer get's a corrupted-file error. I don't know why. I thought it must have something to do with the checksum.

The corrupted file error is also given if there is a file missing. I assume that winrar will extract all files to the same directory, then run the executable from it, which means all the needed files should be there.
I'll suggest again to compare the extracted files with the original ones, and see if there are any differences, otherwise add an extra step to the installation by extracting the files first, then installing.

Also, if you don't mind me asking, why use winrar? If it is so the files will fit in a dvd, wait until the installers are updated to version 2.x.x.x since the files are split a bit better, otherwise I'm not sure what the benefits of zipping the installers are.

You can test it by your self. Take a game with included bin-files, compress it with an archiver an then decompress it. The file are still the same, but if you start the setup, you get an file-interity check error.

K, gimme 20 minutes or so to test it, will report back.

I archive them, cause I have a huge collection of simulators (Nearly all sims since 1989). It has nothing to do with the file-size. Mostly I just archive them without compression. Then I put them on an external drive. In these archives is all included. Iso's from original games, cause I don't use the original CD's. I have games you don't get the originals anymore, if the cd get's crashed (Janes Longbow Anthology for example) or Mods, Updates etc. I made this for years. But with the GOG-Installer there is a problem to do this.

Just for your information, Gowor...
Chains of Satinav's installer has no "file integrity verification" checkbox to speak of. Is that an omission or is it intentional?

Ok, just tried it.
Downloaded UT 2004 gold (smallest multi part installer version 1.x I could find), run it, verified succesfully.
Calculate and store md5 and sha-1 hashes using fciv.
Add to archive (using WinRAR 4.00), compression method store, no splitting of archive.
Extract created archive.
Run extracted setup, integrity check passes.
Verify calculated hashes through fciv, everything fine.

So, more info needed, what version of winrar, and what options for creating the archive and running the setup?

I use Winrar 3.97. I will download 4.00 and look if it makes job. Thank's

Many Thank's to all.

Problem solved! I have downloaded version 4.20 of WinRar and no more file integrity check error. Must have been a problem with version 3.97 of WinRar.

If you open an RAR compressed file with WinRAR and you select "Info", WinRAR tells in the first line the lowest version of WinRAR needed to decompress said file. Normally is v2.9. Probably your WinRAR was corrupted somehow (cracked...?).

Is not possible to compress and then decompress and have a different file. WinRAR uses a checksum (CRC) which is always verifying while compressing and decompressing, and is always the same, before and after compression. Unless, after compression, the RAR files were damaged or corrupted (bad download, faulty media/hard drive/memory), but if that was the case, WinRAR would told you while decompressing the file about a CRC mismatch, probably from a damaged RAR.

Obviously, this was not the case.

No problem, glad I could bring that issue to your attention.